.img-block{
	margin:0px auto;
	margin-top:30px;
	width:60%;
	text-align:center;
}
.content img{
	
	
	height:300px;
}

.tishi{
	text-align:center;
	font-size:20px;
	font-weight:bold;
	margin-bottom:20px;
}

.margin-btn{
	margin-left:30px;
	margin-right:30px;
}